xumrsueinsona obsolete fu'ivla

x1 is an instance of swainsonine [indolizidine alkaloid] (individual or mass) with purity x3.

Swainsonine is a natural product that has been isolated from numerous species of flowering plants and some fungi (see Locoweed). It was first isolated from the plant Swainsona (=sparsueinsona) in Australia.

In notes:

s1 is a plant of genus Swainsona of species/strain/cultivar s2.